Genus Campylodiscus Ehrenberg. 
C. uioosTATUS. (Sm.) Ditclies at Breydon : rare. 
C. CLYPEUS. Ebr. Ditcbcs at Breydon ; very fine and abundant 
in a ditcb near tlie “ Berney Arms.” First found recent 
by tbe late Eobert Wiglian, Esq., of Norwich. 
C. COSTATUS. (Sm.) Wbissonsett, llickling, Tittlesball. 
C. EcriENEis. Ebr. Breydon — rare. 
('. PAnvuLus. (Sm.) Hunstanton, Breydon — rare. 
C. Halfsii. (Sm.) Wells, Humstanton. 
Tribe III.— CHYPTO-KAPHIDE/E. 
Family IX. — Ciiaetocere.e. 
Genus ItiiizosoLE.MA Ehrenberg. 
Found in tbe stomachs of Noctiluca miU- 
i am, Yarmoutli. Tbos. Brigbtwcll, Esq., 
/ F.L.S., was the lirst to observe tbe 
( identity of the living fonns with tbe 
' fossil remains found by Prof. Ehrenberg 
' ill the Virginian deposits. 
Genus Ditylum Bailey. 
1). TRiGONUM. Bail. Stomachs of Noctiluca 7niliari^‘, Yarmoutli 
. { = Tricemtium undulatum, Bri.) 
Genus Ciiaetoceros Ehrenberg. 
C. ? ARM.VTUM. (West.) Yarmouth Sands. This doubtful Diatom 
is frequently found at low water, forming a greenish-brown 
pellicle on the wet sand. 
C. RACTERIASTUSI. (Wallich.) Stoiiiachs of Noctiluca miliarii!, 
Yarmouth. 
C. WiGiiAMii. (Bri.) In a ditch near the “ Benicy Arm.';,” 
Breydon. 
B. IMllRICATA „ 
1*. SETIGERA „ 
li. SlIRUJlSOUI „ 
L*. 8TYEIFORMIS „ 
Family X.— !MELOSIR.E. 
Genus ^Ielosira Agardh. 
JI. AREXARiA. (Moore.) Plentiful in a ditch at Hellesdon ; rare 
in otlier localities. 
